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D( a )
a = 0
a = 0
a = 0
a in (-oo:0) U (0:+oo)
8/a = 9/6 // - 9/6
8/a-(9/6) = 0
8/a-3/2 = 0
8*a^-1 = 3/2 // : 8
a^-1 = 3/16
-1 < 0
1/(a^1) = 3/16 // * a^1
1 = 3/16*a^1 // : 3/16
16/3 = a^1
a = 16/3
a = 16/3
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